Power-hammer.



No. 674,7II. Patented May 2|, |90I. A. SACK.

POWER HAMMER.

(Application led Nov. 27, 1900;)

2 Sheetg-Sheet l.v

(No Model.)-

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Patented Mayan, 190|.

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V'P'owsn HAMMER. {Application led fNov. 27, 1900.) (No Model.) 2 Sheets-Sheet 2.

A TTOHNE YS In: Nomus PETERS ou., moromuo., WASHINGTON. uA l:4

UNITED STATES PATENT EEICE.

ABEL SACK, OF ASHTON, NEBRASKA.

POWER-HAMM ER.

SPECIFICATION forming part of Letters Patent No. 674,711, dated May 21, 1901.

Application filed November 27,1900. Serial No. 37,878. (No model.)

To @ZZ whom, it may concern:

Be it known that I, ABEL SACK, a citizen of the United States, and a resident of Ashton, in the county of Sherman and State of Nebraska, have invented a new and Improved Power-Hammer, of which the following is a full, clear, and exact description.

The object of the invention is to lprovidea new and improved power-hammer which is simple and durable in construction, very effective in operation, readily adjustable for dilerent work, and completely under the control of the operator.

The invention consists of novel features and arts and combinations of the same, as will be fully described hereinafter and then pointed ont in the claims.

A practical embodiment of theinvention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

' Figure l is a side elevation of the improvement. Fig. 2 is a rear end elevation of the same. Fig. 3 is a detail side View of the spring-pitman, and Figs. 4 and 5 are detail views of parts of said pitman.

On a suitably-constructed base A is held an anvil B, carrying aremovable anvil-die C, over which operates a hammer-die C, removably held in a hammer D, having its handle D' in the form of a lever hung on centers E, carried by a link F, fulcrumed at its lower end at F on the base A. A screw-rod G engages the link F and is pivotally connected at G with a brace G2, extending from the base A to the upright A, erected on the said base. A spring G4 is coiled on the screw-rod Gand presses on the link F, so as to hold the latter in position against a nut G3, screwing on the outer end of the screw-rod G. By adjusting the nut G3 the link F is caused to swing forward or backward, according to the direction in which the nut is turned, so as to shift the hammer D and its die C' relatively to the die C and in a transverse direction, according to the work in hand.

The top of the hammer D is pivotally connected by a yielding pitman H with the wristpin I of crank-whee1s I, secured on a shaft J, journaled in suitable bearings arranged on the standard A'. The crank-wheels I have peripheral grooves engaged by belts K, connected with other machinery, so that a continuous rotary motion is given to said crankwheels to impart a swinging motion to the hammer D by the pitman H. The latter is yielding in the direction of its length, and for this purpose consists of a head H', having bearings engaging the'wrist-pin I', and from said head H depends a tubular extension H2, in which is fitted to slide the upper end of a shank H3, havingits lower end pivotallyconnected with the top of the hammer D. On the shank H3 is secured a cross-head H4, through which extend guide-rods H5, secured to the head H. On the guide-rods are coiled the springs H(i H7, pressing against the crosshead H4 on opposite sides, the springs H6 abutting at their lower ends against a connecting-piece H8, connecting the guide-rods H5 with each other. secured by the nuts, as shown in Figs. 1 and 3. By the construction described the pitman yields in the direction of its length, as an npward pressure of the hammer Don said pitman causes the cross-head H4 to press the springs H7, and on a downward pressure of the hammer H the cross-head H4 to press the springs H6. By

hanging the hammer D on a link F, pressed outward by a spring G4, and by connecting the hammer D with a yielding pitman to the crank-wheels it is evident that the desired blow to be given can be struck with any desired pressure, and work of different kinds can readily be fashioned by this trip-ham mer, owing to the yielding between the hammer and the crank-arm and the transverse adjustability of the hammer relatively to the anvil. The crank-wheels I are counterbalanced by counterbalancingweights I2 integral with said wheels and located diametrically opposite the wrist-pins I.

In order to tighten or loosen the belts K to actuate andA to stop the hammer D, I provide a suitable belt-tightener under the control of the operator and constructed as follows: Tightening-pulleys L are journaled on a bellcrank lever L and are adapted to engage one run of the belts K, `and the said bell-crank lever is fulcrumed on the upper end of the standard A and is pivotally connected by a link L2 with a lever N, likewise fulcrumed on said standard. A rod O pivotally connects This piece H8 may be- IOO the outer end of the lever N, andthis rod has its lower end mounted to slide in a suitable bearing O', attached to the standard at the back thereof. The rod O is form ed with a crossarm O2, pivotally connected by links P with a treadle Q, fulcrumed on the baseA and extending to the front of the machine, so as to be within convenient reach of the operators foot. A spring O3 is coiled on the lower end of the rod O and rests on the bearing O', and said spring serves to normally hold the rod O in an uppermost position to hold the tightening-pulleys L out of engagement with the belts K. (See Fig. l.) When the belts Kare not tightened, they run loose around the crankwheels I, and when it is desired to actuate the ham merD the operator presses the treadle Q, so as to impart a downward sliding movement to the'rod O bythe links P against the tension of the spring O3. The downward movement of the rod O causes the swinging of the lever N and a similar movementof the bell-crank lever L' by the link L2, so that the tightening-pulleys L are moved forward in engagement with the belts K to tighten the same. When this takes place, the crankwheels I are rotated to impart a desired swin ging motion to the hammer D.

l/Vhen it is desired to stop the hammer D, the operator releases the pressure on the treadle Q, so that the spring O3 returns the rod O and the parts connected therewith to their former positions. (Shown in Fig. l.)

It will be noticed that the hammer-handle is so supported that it can mo`ve longitudinally, so it can move outward by centrifugal action in making the stroke, and will be retracted by the spring G4, whereby there is secured a drawing stroke of the hammer.

Having thus'fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A power-hammer having a pivoted handle or helve provided with the hammer-head, an operating-crank,and a yielding pitman connecting the crank and hammer-head and arranged to swing at one end with the crank and at its other end with the head as the latter swings in its arc, substantially as set forth.

2. A power-hammer comprising the framing, the operating-crank, the hammer and the longitndinally-springing or resilient pitman between the crank and hammer, substantially as set forth.

3. Ahammerapparatussubstantiallyasdescribed comprising the framing, the hammerlever, an upright link pivoted at its lower end and pivotally connected at its upper end with the hammer-lever, a spring operating to force said link in one direction in line with the direction of length of the hammer-lever, and screw devices for adjusting the said link in opposition to the said spring, substantially as set forth.

4. Ahammer apparatus substantiallyas described comprising the framing, the hammer and its handle or lever, means for operating the hammer, a support forsaid hammer,which support is movable in the direction of length. of the hammer-handle and toward the hammer-head, and a spring resisting such movement of the support whereby the hammer as it is operated in making the stroke may move outward by centrifugal action and will be retracted by the spring, whereby there is secured a drawing stroke of the hammer, substantially as set forth.

5. A power-hammer comprising the anvil, the hammer, operating means and a pitman yielding in the direction of its len gth,and comprising a headv having a bearing for engagement witha wrist-pin and a tubular extension, a shank'slidable in said extension and having means for connection with the hammer, guide-rods on said head, a cross-head on said shank and engaging said guide-rods, and springs on said guide-rods and pressing the cross-head on`opposite sides, as set forth.

6. A power-hammer having a hammer provided with a pivoted handle or lever, a driveshaft having a pulley and a crank, a yielding pitman connecting the crank with the hammer, a drive-belt on the shaft-pulley, a tightening-pulley arranged to bear against said belt, an angular lever carrying the tightening-pulley, a straight lever connected by a link with said angular lever, a spring-pressed rod connected with said straight lever, a treadle, and a link connecting the treadlewith said rod, as set forth.

7. A power-hammer comprising the anvil, the hammer and its lever, the drive-shaft having a crank, a lon gitu dinally-yieldin g pitman between said crank and the hammer, a support to which the hammer-lever is pivoted, said support being movable in the direction of length of the hammer-lever, and a spring resisting such movement of the support, substantially as set forth. v

S. A trip-hammer having an anvil, a hammer, a lever carrying said hammer, a link on which the hammer-lever is fulcrumed;a pivoted screw-rod engaging said link, and a spring pressing said link, as set forth.

9. A hammer apparatus comprising the hammer-head, the crank, and the pitman secured at one end to the crank, and at its other end to the hammer-head, and springing longitudinally between its ends, substantially as set forth.

' In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ABEL SACK.

Witnesses:

I. M. PoLsKr, V. BEzoL.

IOO

IIO 

